Jewel-grinding machine.



FfMUELLER.

JEWEL GRINDING MACHINE.

APPucATmN man mm1-le.

INVENTOR Pat-entedSept. 1l, 1917.

i SHETSSHEE I F. MUELLER.

'JEWE GHINDING MCI-HNEn APPucAlou mi!) mms. 191m Patented Sept. 11, 91?.

4 SHEETSWSHEfF 2.

l [NVENTOR rfedrfch Mueller'.

m@ M TORNEY F. MUELLER.

IEWEL GRINDING MACHINE.

APPLICATION man MM5. 19:6.

1,239,939. Patented Sept. 1l, 1917.

4 SHEETSWSHEE 3 WITNESSES: u INVENTOR v1 sa 69 Friedrich Mueller? AITORNEY UNITED STATES PATENT oEEIcE.

FRIEDRICH MUELLER, 0F IRVINGTON, NEW JERSEY, ASSIGNOR T0 WESTINGHOUSE ELECTRIC .AND MANUFACTURING: COMPANY, A CORPORATION 0F PENNSYLVANIA.

J EWEL-GRINDINC MACHINE.

Specllcaton of Letters Patent.

Patented Sept. 11, 1917.

"jewels which have been provided with two parallel flat faces by a preliminary grinding operation and which are to he finished hy parte shown in section, of a grinding oli' the rough edges and producing an approximately cylindrical form.

The principles of my invention are illustrated in the accompanying drawing in which Figure 1 is a side elevational view, with ewel-grinding machine constructed in accor ance with my invention. Fig. 2 is a plan view of the ftp-5 paratus shown in Fig. 1. Fig. 3 is an end elevational view of the same structure taken from the right of Figs. 1 and 2. Fig. Ll is a vertical sectional view showing a portion of the mechanism for oscillating the grinding lap. Fig. 5 is a plan view of the structure shown in Fig. 4, and Fig'. 6 is a bottoni plan view of the machine showing details.

of the belt-shifting apparatus.

Mv invention consists essentially of a .chuck for holdingV the jewel to be ground consisting of two vertically oplosed rotatable jaws 1 and' 2 and a. rotate' le grinding wheel or lap 3 which is movable bodily toward and from the jaws 1 and 2 and which, during the grinding operation, is both rotated and slowly reciprocated in the Tdirection of its axis of rotation, together with mechanism .for automatically producing these several movements in' proper :timed relatii. y

arts of the machine are supase f1 to which isrigldly at- The several f rted upon a "t ched a bearing bracket 5 andstandards 6 that support a rectangular frame 7. A vertical housing 8 '1s fixed near one end of the frame 7, and the other end of the fra-me is provided with a dove-tail slot 8a, shown in Fig. 3, in which is slidably mounted a frame 9 provided with arms 10 and 11 carrying bearings 18 and 19 in which is s'lidahly mounted a shaft 12 that carries the grinding Wheel 3. The frame 9, with the grinding wheel 3, 1s bodily adjustable toward and from the. chucks 1 and 2 by means of a hand wheel l13 secured to one end of a horizontal shaft 14 which is provided with threads to engage an internally screw threaded opening in a de pending lug' 15 forming a part of the frame 9. The movement of the frame 9`tow ard the right, as viewed in Fig. l, limited by the engagement of the lug withJ the edge of the frame 7, and its movement to they left is limited by means of a screw 16 which is carried in a lug 17, also attached to the frame.

Mounted in bearings in the frame 7 and in the hearing bracket 5 is a transverse hori zontal shaft 20 which carries fast pulleys 21 and 22, a loose pulley 23 and a spur gear wheel 24 meshing with a larger spur gear wheel 25 which is mounted on a horizontal worm shaft 26 mounted in bearings in the frame 7. The threads formed on the worm shaft 26 mesh with two worm Wheels 27 and 28 mounted respectively on vertical shafts 29 and 30. The vertical countershaft 29 is jonrnaled in bearings in the housing 8 and carries, near its upper and lower end, spur gear wheels 31 and which mesh, respectively, with spur gear wheels 33 und 34. The geur wheel 33 is in screwthreaded engagement with a vertical screw shaft 35 which carries, at its lower end, the jaw 1r of the jewel-receiving chuck, andthe gear wheel 34 is keyed to the l wer end of a vertical shaft 36 which carris, at' its up er end, the jaw 2 o f the chuck. t will be `o served that both of the jawsl and' 2 are rotated in unison and in the same direction 'by the gearing just described. The up er end of the screw-threaded Ashaft 35 which carries the chuck 1 is perforated atf37 to receive a pin 38 constituting a handle for turning the screw shaft 35 and thereby adjusting the chuck 1 toward and from the chuck `2. V

The' grindingwheel or lap 3 is secured to the shaft 12 by means of two split nuts'40 and 41 which carry tubular guards 42 and 13'fory preventing'chips or dust from falling upon the shaft 12 and possibly being carriedV into the .bearin s 18 and 19. A driving pulley 44 is attache to one' end ofthe shaft of attachment of shifting forks =7 3 by means of a casing 77 attached tothe.

12 and to the other end is secured a gollar 45 rovided with a groove which receives pins 46 and 47 carried by a shifting fork 48. The fork 48 is carried upon the upper end of a bar 49 which is pivotally mounted on the machine frame at 50 and which extends, near its lower end, through in a plate 51'l attached to a swinging member 52. The movement of the swinging member ,52 is communicated through the pivoted bar 49 and the shifting fork 48 to axially reciprocate the shaft 12. For this purpose, the swinging me ber 52 is actuated in response to the rotation of the shaft 29 through mechanism which is best shown in Figs. 1,'4 and 5, and which comprises a plate 53 secured to the lower end of the vertical shaft 29 and provided with a helical cam groove 54. A roller 55 travels in the cam groove 54 and is secured near one end of a rectangular reciprocating plate 56 which slides in a groove 57 formed in the frame 7. The plate 56 also carries a depending rod 58 the lower end of which is received in a slot 59 in the horizontal end portion 60 of the swinging member 52. The member 52 is pivotally attached to the frame 7 by means of a screw 61 and a spacing sleeve 62.

When the direction oi bodily movement of the inding wheel 3 is reversed'during the cutting operation, the direction of rotation of the jaws the grinding wheel which are in contact may at all times be moving in opposite directions. For this urpose, theV direction of rotation of the riving shaft 20 is intermittently reversed by means of a belt-slutting devlce operated b means of a lug 65 attached to the under side of the worm wheel 28. The rotation of the worm ,wheel 28, brings the lug 65 into Vcb'ntjict with tiruprper end of a lever 66 ,which 1s pivoted at 6 as shown in Fig. 3, and which extends through-an opening 67 in the base 4, as shown in Fig. 6. The lower end of the lever 66 is disposed between tno pins 68 and 69 and is perforated is pivotally attached to the forked end .71 of a belt-shifting lever 72. Near the polnt the link 70, the fork 71 carries a roller 73 engaging a two-peint accentuating device 74 carried upon a rod 75 which is spring-pressed toward the roller a compression spring V76 1nclosed within lower end of the base 4. 4

At the extremity of the longer end of the 'voted lever 72 is secured a pin 78'wh1ch hits a lost-motion connection with a sliding -bar 79 that carries, near one end, two belt- 8 0 and 81 which serve to shift and 83 which are driven in The .belt 82 is adapted 21 and' the belt 85, 1s

two belts-82 opposite directions. to drive the pulley a slot 51 formed 1 and 2 is likewise reversed in'4 order that the portions of the jewel and ofV are to be imposed upon my to receive a link which 1 adapted to drive the pulley 22 w 'le either of these belts may be brought in o coperation with the loose pulley 23. The size of the worm gear 28 which actuates the beltshifting mechanism is so selected that the belts are quickly shifted just as the grinding wheel 3 reaches the end of its lateral bodily movement in each direction.

In the operation of my machine, a rough jewel having two parallel sides ls placed between the jaws 1 and 2, and power is applied to the pulleys 21 and 22 and to the pulley 44. The jaws 1 and 2 are rapidly rotated in unison through the shaft 20, gears 24 and 25, worm shaft 26, worm wheel 27, countershaft 29 andgear wheels 31, 32, 34 and 35. The grinding wheel is simultaneously rotated by the pulley 44 and is slowly oscillated laterally through the agency of the cam plate 53, the roller 55, sliding plate 56, pin 58, swinging'lever 52, bar 49 and shifting fork 48. As 'the grinding wheel approaches the end of its movement in one direction, the lug 65 attached to the worm wheel 28 oscillate's the lever 66 about its pivot and, through the link 70, lever 72, bar

9 and shifting forksSO and' 81, shifts the belts 82 and 83 and .thereby reverses the direction of rotation of the shaft 20, whereupon the jaws 1 and 2 begin to operate in the opposite direction. The reversal of the direction of rotat' n of the jaws 1 and 2 involves the revers of the shaft 29 and, consequently, of the earn plate 23 and the roller 55, following the convolutions ofthe spiral cam 54 and, consequently, approaching the axis of the shaft 29, swings the member 52 about its pivot and slowly moves the grinding wheel 3 along its axis in the reverse direction.

The structural details off my machine may be variously modified without departing from the spirit and scope of my invention and it is to be understood that no limitations invention except such as are indicated in the appended claims.

I claim as my invention:

1. In a machine for grinding bearing jewels and the like, the combination with means for rotatably supporting the object to be ground, and agi-Hiding member that is rotatable upon an axis substantially perpendicular to the axis of rotation of the said object, of means for bringin the said grinding member into contact with the said object, and means for axially moving the said grindin member while in contact with the said object.

2. In a. machine for grinding bearing jewels and the like, the combination with means for rotatably supporting the object t0 be ground, and a grinding member that is rotatable upon an axis substantially perpendicular to the axis of rotation' of the said object, of means-for bringing a rotary grinding member into Contact with the said object, and automatic means for rotating the said grinding member and for simultaneously imparting an axial bodily move ment thereto.

In a mavhine for grinding bearing jewels and the like, the eombinatimi with means for rotatably supporting the object to be ground, of means for bringing a rotary grinding member into Contact with the said object,` automatic means for rotating the said grinding member andltor simultaneously imparting an axial and rectilinear bodily movement thereto, and means for periodically reversing the direction of rotation ot' the said object and the direction of bodily movement of the said grinding member.

4. In a machine for grinding bearing jew els and the like, the eombinatirm of means for rotatably supporting the objeet to be ground, a grinding member rotatable around an axis perpendicular to the axis of rotation of the said member means for axially moving the said grinding member in Contact with the said object so that the points of the said member and of the said object that are in Contact move in opposite directions., and means for periodically reversing the. direction of rotation of the said object and the direction. of axial niovement ot' the said grinding member.

5. In a machine for grinding bearing jew@ els and the like, the combination with means Jfor rotatably supporting the objeet to be ground, of a rotary grinding member adapted to engage the said objert, means for periodically reversing the direction ot' rotation of the said objeet, and automatic means, operable in timed relation to the said reversing means, for imparting axial bodily movement to the said grinding member.

6. In a machine For grinding bearing jewels and the like, the eombinatiou with jaws tor supporting the objert to be, ground, oi. means for rotating the said jaws and for periodically reversing their direction of rotation comprising a driving shatt. puli'onneeting the said shaft to the said jaws, oppositely driven belts cooperating with the said pulleys, a belt shifter, and means eom prising a portion of the said bearing for 'periodically operating the said beltshifter to reverse the direction oi rotation ot' the said shaft.

leys secured thereto, gearing operativel 7.111 a machine for grinding bearing jewels and the like, the combination with jaws for supporting the object to be ground and means for rotating the said jaws eom prising a driving shaft, a eonntershaft, and gearing for operatively connecting the said driving shaft to the said jaws through the said eonntershaft, oi a rotary grinding member, and means operable in response to the rotation of the said eonntersbaft for axially reciprocating the said grinding member.

8. In a machine for grinding bearing jewels and the like,the combination with jaws for supporting the object to be ground and means for rotating the said jaws comn prising a driving shaft, a eountershat't, and gearing for operatively connecting the said driving shaft to the said jaws through the said counter-shaft, of a rotary grinding member, and means operable in response to the rotation of the said countershaft for axially reriproeating the said grinding member, the said ririproeating means comprising a eam secured to the said countersha'ft, a member adapted to be oscillated by the said ram, and a shifting lever operable by the said oscillating member to move the said. grinding member.

tl. 1n a machine for grinding bearing jewels andthe like, the combination with jaws l'or supporting the object to be ground and means tor rotating the said jaws uomprising a driving shaft, a eountershaft, and gearing for ope 'atively connecting the said driving shaft to the said jaws through the said eountershaft, of a rotary grinding member, and means operable in response to the rotation of the said countershaft lfor axially reciprocating the said grinding member, the said reciprocating means comprising a plate secured to the said eountersliatt and provided with a spiralV ram groove, a roller adapted to travel in the said groove, a pivoted member operatively oonuevted at one end to said roller and provided at its other end with a slot, and a pivoted shifting lever extending through the said slot and adapted to move the said grinding member.

In testimony whereof, I have hereunto subscribed my name this 28th day of Dee., 1915.

FRTDRTCH MUELLER. 

